But Captain Crosschain, if I stopped posting I would miss the hilarious (in a pathetic kind of way) replies like yours.

A little video I found interesting comparing carbon, al, and ti tubing.

http://www.sicklines.com/2006/07/29/...y-of-titanium/

I wonder what steel would have done. I like how the aluminum one just folded.

Strictly speaking, you don't actually have to post in order to read replies. :love:

Neat video, but probably the least objective/conclusive test I've ever seen. He didn't tell us the grade of aluminum, the type of carbon, tube size, what bikes the tubes came from, etc, etc.

Scandium vs AL & TI?

No. This whole scandium thing is still confusing people :)

Go to Easton's website for a very good beginner's level explanation of what scandium is used for. Scandium is not used pure for any bike parts. It is an alloying ingredient in aluminium alloys. I repeat: scandium is an alloying ingredient in aluminium alloys, nothing more.

For those of you who don't weant to, Scandium is added to aluminium alloys for one reason and one reason alone. It does not make the tube appreciably stronger. It does not make the tube appreciably tougher. It does to weldments what has never been done in aluminium alloys before - it maintains a fine grain in the HAZ, a phenomenon that used to be restricted to steels only. Scandium vastly ******* the rate of grain growth in areas above the recystallization temperature of aluminium alloys. That is all it does, as far as you will be concerned.

What this means to the layman? The weld isn't brittle any more, and the solution treatment of the weld zone doesn't cause a massive, coarse precipitation there, while a fine one everywhere else. It means the metal in the weld is as strong as the metal in the tube, give or take work-hardening effects. This is an entirely new thing or aluminium alloys.


Carbon fibres at the scale you see in bike frames are approximately as strong as 853 (as supplied, not in the weld-zone) in tension. Their impact toughness in plain strain (what you commonly see in a Charpy impact test and what you will probably see most in failures) is about one fiftieth of that of an equal sized volume of stuctural, high-strength steel. Steel of the three is the toughest. Aluminium second, at about one third to one quarter that of steel.

If I didn't post how would I get to read his hilarious replies to MY posts?

Hey Hank, Love your picts - - but when it comes to your banter, maybe can get our mod to just create an "Argue with Hank" sticky :D

Who is forcing you to read posts that you don't like?

Does anyone other than Pete Fagerlin think "Hank Rearden" is amusing ?

Did Hank say something? I wasn't reading it . . . .

Yes.

As an objectivist, of course.

99% of conflict with him can be avoided with reading comprehension skills. Amusing since English is not, I predict, his first language.:)

Here is an amusing question related to the thread: Has anyone ever attempted to make frames out of ceramic material? :D How about magnesium? Why or why not?

You know Hank, you're alot like Raiyn used to be. The only difference is that Raiyn didn't just claim knowledge, he shared it. That was his one redeeming quality that was good enough to make him an asset to the community. Without it, he would have just been an abusive hack, much like you are.

You're not nearly as cool or as clever as you think you are. You're just obnoxious and annoying.

Magnesium frames exist. Dawes (responsible for Kirk's bloody catastrophe) and Merida, who are just outright lying to their customers, Zinn and Paketa are or have manufactured in magnesium alloy. I've written before on why I dislike magnesium intensely as a structural material, but it seems that certain bicycles companies, and a massive automobile are pressing ahead with integrating magnesium alloys into stuctural components.

Now, I can understand why a company may use Mg alloy for tubular bicycle frames, on the proviso that the frameset may last a few years at most. But the car consortium intends to make sub-frames and chassis parts from it. They will be exposed to road spray over many years. I bloody cringe.



As for ceramic? Carbon fibres are technically ceramic :) Well, not quite, but I can't see why the manufacture of fibre-reinforced composites using perhaps partially-stabilized zirconia couldn't be tried. Much tougher fibres than carbon fibre.

Doesn't Mg catch fire? Imagine a hot disc & a Mg frame...

So because I don't always take the time to share some basic, and easily obtainable, minutia, I"m a hack? Cool!

Here, you need this:

http://www.uab.edu/images/imedpub/Kleenex.jpg

If that doesn't work, try using the ignore function. You'll feel much better about yourself.

Not unless you've made a frame out of ribbon or powder. Or held a blowtorch to it.

Why does it seem like your job is more fun than mine is? :)

'Cause I get to play with powersaws, tonnes of liquid iron and my own budget?

I wanted to play with milling machines, lathes and TIG torches; but college steered me toward playing with words and images instead. There's a space in my shop where a Bridgeport will probably never sit. =sigh=

6000 Vs. 7000 Alum. Frame,,,
 

So What Is The Difference In My 6000 Series Frame And A 7000 Series Frame?

1,000.

Rather than plagiarize this site's chart, I'll just give you the link:

http://www.brucescycleworks.com/tips/tip18.html

(BTW, he misused the phrase 'begs the question' :D)

100% of the conflicts with him would be avoided, if sombody were to choke him out. I'm not an advocate of this type of behavior, I'm just pointing out a fact.

Don't get rid of Hank, I find him funny.

Your deep-rooted feelings of inadequacy would end if someone were to make you sleep with the fishes. I'm not an advocate of this type of behavior, I'm just pointing out a fact.

I would first need to have a feeling of inadequacy, for this to be a fact.
BTW, Pete, have you found a therapist to help with your Narcissism?

I had a job for 12 years where I "played" with and old bridgeport mill,an old lathe(kompf I think),MIG,TIG, stick welding and trouble shooting.Lots of fab work as well. Now I swing a hammer building multi-million dollar custom homes. I've been lucky to have jobs I really like. I love the fact that I learn something every day. You should get that mill you would love it. I have learned a lot about differnt metals and welding over the years but I don't feel qualified to give my opinion on frame building.:o

Bi Ti. Bicycle Ticycle. You'll never regret it.